GoG Galaxy was a bad idea that undermined GoG almost immediately.

They still market themselves as "GOG.COM, the DRM-free home for a curated selection of games". But there are two forms of DRM they allow.

#1, you can't use multiplayer without providing a registration code.

#2, you can't play the game unless you're running Galaxy in the background.

I have a hard time believing they honestly think "well, DRM is a bad thing in general, but not when we're doing it".